I'm apparently reading challenged tonight... You said Ref 25 and I read RF-7. The Ref 25 are
97dB efficient , which is still quite good, and Klipsch actually looks to recommend 125W max power for them.
The 7500 will be the replacement for the 755 - 200Wx5, new faceplate, and balanced inputs (five channel sibling of the 7700, which will be the 770's replacement).